It might be the circuit protection kicking in - I have exactly the same issue.
To reset the "breaker" you have to kill power to the PSU then it will start up again.
Do you know what caused the power loss? Or are they just cutting out?
If they are just cutting out then it is overload.
oh no it was me switching configurations around, it may not be an issue with an actual power loss due to longer length
jw if anyone had a cleaver way of fixing this cheap
If you are having trouble restarting your PS after a shut down; the only likely issue that I can point to is your 5V reserve rail.
This rail is responsible for the power standby necessary to start the PC.
It is also the first rail to take damage when you overtax your system: usually, through a ground imbalance.
This means that you are overdoing it. If you have an 850W PS, you only want to use 680ish or less for video cards.
It is likely fixable, but way beyond your capabilities (no offence). May be worth it if you could fix it, but not worth it to pay.
Unfortunately, like a $2 whore when your're done, You're Done!
Are they under warranty?